416 Rebuild

[Pont400ex]

In the process of putting puttin a new 11.1 high compression piston in, and making it a 416 from a 408. Question is once the piston is in should i break the motor in with a full synthetic oil or a semi, then switch to a full once its broken in? thanks

[kellimarie]

When I did my 416 rebuild, we broke it in with standard non synthetic oil, then switched to full synthetic. That is what I would reccommend

[pitkendall]

i agree thats what i did the race shop around here thats a honda dealer and a site sponsor here that build alot of drag and moto bikes said every bike they build thats what they do cus if u break it in with full or semi synthetic oil the rings wont seat right

[honda400ex2003]

good info to know thanks guys. steve

[Gibson]

You have to run conventional oil in the motor to break it in. Synthetic oil doesn't have the right minerals in it to break in a motor. but after the break in, i would run nothing but synthetic in it.